2: If you really wanna be nerdy with this; assume the electron count on the periodic table is increased proportionally with the size of each robot. Re-order table based on that.
Oh, Pm is Promethium, not Plutonium, Rb is Rubidium, and is obviously a Ball, Ah! Po is Polonium, and is Prometheus, also known as Robo from Chrono Trigger. Hg is Mercury and Hygogg.
Rf is the main golem from Break Blade - Dirfringe. La is the Suzuku's unit from Code Geass - Lancelot. Pa is from Zeta Gundam - Palace Athene Cr is from Warhammer 40K Tau Army - Crisis Battlesuit
Ca- Mad Cat (Timber Wolf) from Battletech Cr- Crisis Suit from Warhammer 40k At- Atlas from Battletech Ce- Compatible Kaiser from SRW: OGG (not 100% on this one) Yb- Ialdabaoth from SRW: Alpha 3/OGG U- Urban Mech from Battletech Es- Escaflowne, title mech of the same show